{"id":4958,"date":"2020-12-28T09:00:27","date_gmt":"2020-12-28T09:00:27","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=4958"},"modified":"2020-12-28T09:00:27","modified_gmt":"2020-12-28T09:00:27","slug":"molten-metal-processing","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/molten-metal-processing\/","title":{"rendered":"Pengolahan Logam Cair"},"content":{"rendered":"<p>Tergantung pada penggunaan produk akhir, tingkat kebersihan logam cair pun berbeda-beda. Semakin tipis produk akhir yang dibutuhkan (kaleng yang mudah dibuka, pendingin panas, dll.), atau semakin tinggi persyaratan kualitas permukaan pada lembaran logam presisi tinggi (dasar pelat PS, papan dekoratif cermin, dll.), semakin tinggi pula persyaratan kebersihan logam cair tersebut. Oleh karena itu, pengolahan logam cair menjadi sangat penting.<\/p>\n<p>Selama proses peleburan ulang, tergantung pada muatan tungku, klinker seperti sisa logam, potongan sisa, dan bahan lembaran mengalami oksidasi yang parah serta mengandung berbagai jenis inklusi non-logam. Yang paling umum adalah bubuk alumina fase \u03b1 dan MgAl\u2082O\u2084 (magnesium-aluminium). Partikel refraktori berbasis spar (MgAl\u2082O\u2084), lapisan oksida, borida, magnesium oksida, magnesium klorida, serta oksida non-logam lainnya. Inklusi yang melebihi batas kandungan yang ditentukan dapat menyebabkan berbagai masalah, seperti terputusnya kontinuitas paduan aluminium, terbentuknya pori-pori, atau patahnya strip.<\/p>\n<p>Ketika strip aluminium digunakan sebagai bahan dasar pelat PS, strip tersebut mengalami deformasi akibat proses penggulungan, dan inklusi akan membentuk gelembung-gelembung yang umum muncul di permukaan produk akhir. Selain itu, beberapa inklusi padat yang sangat keras (seperti partikel bahan tahan api) dapat merusak permukaan rol mesin penggulung, meninggalkan bekas berulang pada strip, dan menjadi sumber retakan.<\/p>\n<p>Hidrogen memiliki kelarutan yang tinggi dalam aluminium cair. Hidrogen dalam aluminium cair sebagian besar berasal dari reaksi kimia antara aluminium dan uap air dalam gas tungku, sedangkan sebagian lainnya berasal dari hidrogen dalam gas tungku atau udara. Selain itu, ingot aluminium rentan bersentuhan dengan uap air di udara saat disimpan di tempat terbuka, yang juga merupakan alasan penting meningkatnya kandungan udara dalam aluminium cair. Saat melakukan pengecoran slab, perhatikan kadar air di lingkungan sekitar dan suhu pengecoran. Semakin tinggi suhu larutan, semakin besar kelarutan hidrogen dalam aluminium cair, dan tidak dapat dihindari bahwa ingot tersebut mengandung hidrogen.<\/p>\n<p>Pengaruh hidrogen dalam lelehan aluminium dapat menyebabkan timbulnya cacat seperti porositas, pori-pori, dan bintik putih selama proses pemadatan ingot. Ketika suhu ingot meningkat secara signifikan, mulai dari proses penggulungan panas hingga proses anil, pori-pori yang disebutkan di atas akan membentuk gelembung di permukaan ingot. Pori-pori ini akan retak di tepi strip selama proses penggulungan.<\/p>\n<p>Dalam proses pembuatan ingot, pengendalian kebersihan logam cair merupakan bagian yang sangat penting dari proses tersebut. Itulah sebabnya, pengolahan logam alkali dan inklusi dalam logam cair di dalam tungku perlu dilakukan pada berbagai tahap proses pengolahan logam aluminium cair. <a href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/degassing-system\/\">Sistem penghilangan gas<\/a>\u00a0dan peralatan penyaringan merupakan syarat dasar dalam pengolahan logam cair untuk menghasilkan logam cair yang bersih.<\/p>","protected":false},"excerpt":{"rendered":"<p>Depending on the use of the final product, the level of cleanliness of the molten metal is different. The thinner the final product is required (easy-open cans, heat sinks, etc.), or the higher the surface quality requirements of high-precision strip foil (PS plate base, mirror decorative board, etc.), the higher the requirements for the cleanliness [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4959,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4958","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Metal Processing by Degassing\u00a0and Filtering Equipment<\/title>\n<meta name=\"description\" content=\"Degassing system\u00a0and filtering equipment are the basic conditions for molten metal processing to obtain clean molten metal.\" \/>\n<meta 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